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Pathogen research abs 1 || Pathogen research abs 2 || Pathogen research abs 3 || Pathogen research abs 4 || Pathogen research abs 5 || Hormone and endocrine research abs 1 || Hormone and endocrine research abs 2 || Hormone and endocrine research abs 3 || Hormone and endocrine research abs 4 || Hormone and endocrine research abs 5

Gen Comp Endocrinol. 2002 Sep;128(2):112-22.
Ontogeny, tissue distribution, and hormonal regulation of insulin-like growth factor binding protein-2 (IGFBP-2) in a marine fish, Sparus aurata.

Funkenstein B, Tsai W, Maures T, Duan C.

National Institute of Oceanography, Israel Oceanographic and Limnological Research, Tel Shikmona, PO Box 8030, 31080, Haifa, Israel. bruricean.org.il

In this study, we have cloned insulin-like growth factor binding protein (IGFBP)-2 from a marine hermaphroditic fish species, the gilthead sea bream (Sparus aurata), and determined its structure, ontogeny, tissue distribution, and hormonal regulation. The sea bream IGFBP-2 precursor consists of 286 amino acids, including a putative signal peptide of 22 residues and a mature protein of 264 residues. The overall sequence of sea bream preIGFBP-2 is 52-39% identical to that of zebrafish, chick, mouse, rat, pig, sheep, bovine, and human preIGFBP-2. The cysteine-rich N- and C-terminal domains, which are believed to be important for IGF binding, show a greater degree of conservation with a sequence identity of 73-56% and 53-50%, respectively. Sea bream IGFBP-2 contains 18 cysteine residues and their alignment is identical to those of other vertebrate IGFBP-2s. The Arg-Gly-Asp (RGD) sequence, present in the C-terminal domain of all known IGFBP-2, is also present in the sea bream. Northern blot analysis of RNA samples extracted from adult liver and developing larvae, revealed two transcripts of about 1.3 and 2.5 kb. RT-PCR analysis showed that IGFBP-2 was expressed in all adult tissues studied, with the highest levels found in liver and skin. IGFBP-2 transcripts were detected in gonad during reproductive cycle of S. aurata. Highest levels of IGFBP-2 mRNA were found in bisexual young gonads, and the levels decreased with gonad development and relatively high levels of IGFBP-2 mRNA were found in the ovary during spawning. By contrast, testicular IGFBP-2 mRNA levels were very low. RT-PCR detected IGFBP-2 mRNA throughout development in unfertilized eggs, embryos, and larvae, with highest levels observed after day 3 post-hatching, suggesting that this mRNA is the product of both the maternal and embryonic genomes. High variability in steady-state levels of hepatic IGFBP-2 mRNA was noted in adult fish, resulting in a statistically insignificant response to growth hormone treatment. These results suggest that the structure of IGFBP-2 is conserved in sea bream and that IGFBP-2 mRNA is expressed during early development and in gonad during the reproductive cycle, suggesting that it may play a role in gilthead sea bream development and reproduction.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12392684&dopt=Abstract

Gen Comp Endocrinol. 2002 Sep;128(2):149-52.
Immunocytochemical detection of leptin in non-mammalian vertebrate stomach.

Muruzabal FJ, Fruhbeck G, Gomez-Ambrosi J, Archanco M, Burrell MA.

Department of Histology and Pathology, University of Navarra, Pamplona, Spain.

Leptin is a hormone produced and secreted mainly by adipocytes, but also by other tissues such as placenta, brain, mammary, and pituitary glands. The gastric epithelium has also been reported as a source of leptin in mammals. In this study we examined the presence of leptin in the stomach of non-mammalian vertebrates (trout, frog, lizard, and snake). Immunolabeling for leptin was found in the oxyntic-peptic cells of the frog and the two reptilian species studied, but not in the trout. In the trout and the lizard leptin immunoreactivity was also detected in scattered cells presenting the typical features of endocrine cells. In the trout, the frog and the snake, in addition to the epithelium, leptin immunostain was found in elements of the enteric nervous system that were also positive for VIP.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12392688&dopt=Abstract

Arterioscler Thromb Vasc Biol. 1999 Apr;19(4):1034-40.
Antagonistic effects of 17 beta-estradiol, progesterone, and testosterone on Ca2+ entry mechanisms of coronary vasoconstriction.

Crews JK, Khalil RA.

Department of Physiology, The Center for Excellence in Cardiovascular-Renal Research, University of Mississippi Medical Center, Jackson, MS 39216, USA.

The clinical observation that coronary artery disease is more common in men and postmenopausal women than in premenopausal women has suggested cardioprotective effects of female sex hormones including hormone-mediated coronary vasodilation. The purpose of this study was to investigate whether the sex hormone-induced coronary relaxation is caused by inhibition of Ca2+ mobilization into coronary smooth muscle. The effects of 17beta-estradiol, progesterone, and testosterone on vascular reactivity and 45Ca2+ influx were tested in deendothelialized coronary artery strips isolated from castrated male pigs. Prostaglandin F2alpha (PGF2alpha) (10(-5) mol/L) caused significant, maintained contraction of coronary artery strips. Caffeine (25 mmol/L), an activator of Ca2+ release from intracellular stores, caused transient contraction in Ca2+-free solution whereas membrane depolarization by 96 mmol/L KCl, an activator of Ca2+ entry, caused maintained contraction in the presence of external Ca2+. The 3 sex hormones caused significant and concentration-dependent relaxation of PGF2alpha- and 96 mmol/L KCl-induced contractions with 17beta-estradiol being the most effective. The sex hormones did not significantly affect the transient caffeine contraction in Ca2+-free solution. In contrast, the sex hormones significantly inhibited the PGF2alpha- and KCl-induced 45Ca2+ influx. 17beta-Estradiol caused similar inhibition of PGF2alpha- and KCl-induced contractions, suggesting inhibition of the same Ca2+ entry mechanism. However, progesterone and testosterone caused greater relaxation of PGF2alpha-induced contraction than of KCl-induced contraction. We conclude that in coronary arteries of castrated male pigs, sex hormones inhibit Ca2+ entry from extracellular space but not Ca2+ release from intracellular stores. 17beta-Estradiol mainly inhibits Ca2+ entry, whereas progesterone and testosterone cause coronary relaxation by inhibiting other mechanisms in addition to Ca2+ entry.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10195933&dopt=Abstract

Gen Comp Endocrinol. 2002 Oct 1;128(3):180-92.
Sex differences in lipid metabolism during reproduction in free-living tree lizards (Urosaurus ornatus).

Lacy EL, Sheridan MA, Moore MC.

Department of Biology, Georgia State University, Atlanta, GA 30303-3083, USA. evalacsu.edu

Understanding the relationship between energy metabolism and signals that regulate reproduction may provide insight into the coordination of the energetically costly behavioral and physiological events that occur during reproduction. Significant changes in the utilization of stored lipids may occur during reproduction and the patterns of utilization observed often differ between females and males. Changes in levels of stored lipid reserves have been described extensively in animals from many taxa, but detailed biochemical analyses of alterations in the enzymes and substrates regulating lipid metabolism during periods of active reproductive effort rarely have been performed. In addition, few studies have compared males and females from the same population during the same reproductive season. In this study we examined lipid metabolism in free-living female and male tree lizards across a single reproductive season. We measured lipid stores, circulating lipid substrates, and the activities of enzymes regulating lipid storage and release in both liver and adipose tissue. Overall, females and males showed significant variation in abdominal fat body mass, liver total lipid, the activity of an enzyme regulating fat storage (DGAT) in both of these tissues, and circulating free fatty acids across the reproductive season. In females, total fat body mass, adipose DGAT, liver lipid, and liver DGAT significantly varied across reproductive stage, with vitellogenic and Gravid females often at opposite extremes. In males, fat body mass and liver fat varied across reproductive stage (without significant variation in DGAT in either tissue), as did circulating glycerol and free fatty acids. Correlations among sex steroid hormone levels and lipid metabolism variables suggested a role for these hormones in producing the patterns observed in each sex and in the observed sex differences lipid metabolism. 2002 Elsevier Science (USA)

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12392692&dopt=Abstract

Gen Comp Endocrinol. 2002 Oct 1;128(3):214-23.
KClO(4) inhibits thyroidal activity in the larval lamprey endostyle in vitro.

Manzon RG, Youson JH.

Department of Zoology and Division of Life Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ont, Canada MIC 1A4. Richard.Manzoregina.ca

An in vitro experimental system was devised to assess the direct effects of the goitrogen, potassium perchlorate (KClO(4)), on radioiodide uptake and organification by the larval lamprey endostyle. Organification refers to the incorporation of iodide into lamprey thyroglobulin (Tg). Histological and biochemical evidence indicated that endostyles were viable at the termination of a 4h in vitro incubation. A single iodoprotein, designated as lamprey Tg, was identified in the endostylar homogenates by polyacrylamide gel electrophoresis and Western blotting. Lamprey Tg was immunoreactive with rabbit anti-human Tg serum and had an electrophoretic mobility similar to that of reduced porcine Tg. When KClO(4) was added to the incubation medium, both iodide uptake and organification by the endostyle were significantly reduced relative to controls as determined by gamma counting, and gel-autoradiography and densitometry, respectively. Western blotting showed that KClO(4) significantly lowered the total amount of lamprey Tg in the endostyle. Based on the results of this in vitro investigation, we conclude that KClO(4) acts directly on the larval lamprey endostyle to inhibit thyroidal activity. These data support a previous supposition from in vivo experimentation that KClO(4) acts directly on the endostyle to suppress the synthesis of thyroxine and triiodothyronine, resulting in a decrease in the serum levels of these two hormones. 2002 Elsevier Science (USA)

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12392695&dopt=Abstract

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